Improved composition roofing



b i w amats am glen-1c i iar. eteea -CLEM-ENT FLHlNlVIAN, OF CHICAGQ,'ILLlNQi$. 136mm Pam: No. 84,119, dated November 17, 1868.

DIPROY'ED COIEPOSITION ROOFING.

The Schedule tofu-red in these Letters Patent and napkins part or the same.

To. all whom it may concern k Be it known that I, Gunmen F. HINMAN, of the city of Chicago, in the county of (look, and State of Illinois, have'invented or discovered an Improved Composition for Roofing; and I hereby declare that the following is a full, clear, and exact description thereof, suflicient to enable those skilled in the art to make and use-the same,

- K I am aware that numerous roofing-compositions are the material used is subject to evaporation or desiccation, and in time becomes quite hard, and liable to crack.

Coal-tar, whichis thepxincipal ingredient in these compositions, contains a large amount of naphtha, which always evapoiates, leaving only the resinous, portion, which, in cold weather, becomes brittle; hence, the expension and contraction of the roofing-boards, changes of temperature, settling of walls, chimneys, and other causes, produce cracks in these compositions, and roofs covered with them become leaky.

The objeot'of my invention is to obviate the objec-- tions stated, and provide a roofing-composition which shall retain its elasticity fora long period, and under all ordinary circumstances; and to accomplish this objeet I use glycerine, oil, and dissolved India rubber. either separately or combined.

My composition is prepared as follows: To one barrel of ooal-tar'I'add about two gallons of glycerine, about two quarts of lard-oil, or other. suitable oil, and about three pints of dissolved rubber. When; these have been thoroughly mixed, I add kaohn,-or other dag-gypsum, decomposed -feldspar, or other similar suitable 'substanceimtil the mixture has about the consistency of thick paint. p

I use animal oil, because vegetable oils evaporate t r p l i r Itwill not do to dispensewith the glyeerine and use only animal oil, for the reason thatthe quantity of oil are-use,buttheyaie bjeetionablqforthereasou that which, in that case, would be required would interfere with the adhesive property of the composition. The

quantity of oil hereinabove mentioned does not have any injurious efi'ect. Intact, a small quantity of oil seems to render the coal-tar more adhesive.

. The dissolved rubber has a tendency to gloss over and form a skin on the surface of the composition when applied, rendering it more impervious to water, and aiding in preventingevapomtion.

lfionot confinemyself'to the exzmt'quantities or proportions of the glyccrine, oil, and rubber mentioned, as the same may be somewhat varied without essention.

The well-known non-evaporating property of glycerine renders my composition very durable, keeping it sufl'ieiently soil; audelastic for a long time.

' My composition can be more readily prepared by first heating the coal-tar, and in use it may be applied with a brush to felting, paper, canvas, or otherwise, in'

the usual manner. I

By. using a greater quantity of glycerine, the oil may bedispensed with, and a good composition can be made, but I prefer to use a'small quantityof'oil, as stated, its

efiect being advantageous.

tially changing the nature or quality of the composi 

